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332         THE MAGIC OF JEWELS AND CHARMS
trephining was performed at this early date, almost if not quite exclusively in the case of infants, and it is believed principally for the cure of epilepsy. If the child survived the operation its skull was thought to have acquired a certain magic power. This idea had its rise in the belief that epi­lepsy was the result of an indwelling evil spirit, so that if the disease disappeared as a result or sequence of the opera­tion, this evil spirit was believed to have made his way out through the aperture. On the eventual death of one whose skull had been successfully trephined, disks were sometimes cut just on the edge of the opening through which the pos­sessing spirit had slipped out, leaving as a trace of his passage some of his diabolic but still potent virtue.25 That the superstition regarding these cranial disks lasted well into the sixteenth century, even among some of the educated, is proven by the fact that on a bracelet which belonged to and was worn by Catherine de' Medici, one of the talismans was a piece of a human skull.
Attention was first called to the strange amulets taken from the human skull by the operation of trephining, by M. Prunetière, at a meeting of the French Association for the Advancement of Science, held in Lyons in 1873.2* The specimen he then exhibited came from a sepulture in the department of Lozère. This particular example showed a break on the edge, and M. Paul Broca has conjectured that a small piece may have been chipped off, so that it might be pulverized and administered as a powder to persons suffer­ing from disease of the brain, a treatment favored by those who doubted the generally-believed supernatural origin of
a Renel, " Lee religions de la Gaule avant le Christianisme," Paris, 1906, p. 97.
* See Paul Broca, " Sur la trepanation du crâne et les amulettes crâniennes de l'époque nêolitique," Revue d'Anthropologie, vol. vi, 1877, pp. 1-42, 193-225 ; and also his " Amulettes crâniennes et trepanation préhistorique " in the same Revue, vol. v, 1876, pp. 106, 107.